/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.dxf2.metadata.objectbundle.validation;

import static java.util.Collections.emptyList;
import static org.hisp.dhis.dxf2.metadata.objectbundle.validation.ValidationUtils.createObjectReport;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import org.apache.commons.lang3.StringUtils;
import org.hisp.dhis.attribute.Attribute;
import org.hisp.dhis.common.IdentifiableObject;
import org.hisp.dhis.common.IdentifiableObjectUtils;
import org.hisp.dhis.dxf2.metadata.objectbundle.ObjectBundle;
import org.hisp.dhis.feedback.ErrorCode;
import org.hisp.dhis.feedback.ErrorReport;
import org.hisp.dhis.feedback.ObjectReport;
import org.hisp.dhis.importexport.ImportStrategy;
import org.hisp.dhis.preheat.Preheat;
import org.hisp.dhis.preheat.PreheatIdentifier;
import org.springframework.stereotype.Component;

/**
 * @author Luciano Fiandesio
 */
@Component
public class UniqueAttributesCheck implements ObjectValidationCheck {
  @Override
  public <T extends IdentifiableObject> void check(
      ObjectBundle bundle,
      Class<T> klass,
      List<T> persistedObjects,
      List<T> nonPersistedObjects,
      ImportStrategy importStrategy,
      ValidationContext ctx,
      Consumer<ObjectReport> addReports) {
    List<T> objects =
        selectObjectsBasedOnImportStrategy(persistedObjects, nonPersistedObjects, importStrategy);

    if (objects.isEmpty()
        || !ctx.getSchemaService()
            .getDynamicSchema(klass)
            .hasPersistedProperty("attributeValues")) {
      return;
    }

    for (T object : objects) {
      List<ErrorReport> errorReports =
          checkUniqueAttributes(klass, object, bundle.getPreheat(), bundle.getPreheatIdentifier());

      if (!errorReports.isEmpty()) {

        addReports.accept(createObjectReport(errorReports, object, bundle));
        ctx.markForRemoval(object);
      }
    }
  }

  private List<ErrorReport> checkUniqueAttributes(
      Class<? extends IdentifiableObject> klass,
      IdentifiableObject object,
      Preheat preheat,
      PreheatIdentifier identifier) {
    if (object == null
        || preheat.isDefault(object)
        || !preheat.getUniqueAttributes().containsKey(klass)) {
      return emptyList();
    }
    if (preheat.getUniqueAttributes().get(klass).isEmpty()) {
      return emptyList();
    }

    Map<String, Map<String, String>> uniqueAttributeValues =
        preheat.getUniqueAttributeValues().computeIfAbsent(klass, key -> new HashMap<>());

    List<ErrorReport> errorReports = new ArrayList<>();
    object
        .getAttributeValues()
        .forEach(
            (attributeId, value) -> {
              Attribute attribute = preheat.get(identifier, Attribute.class, attributeId);

              if (attribute == null || !attribute.isUnique() || StringUtils.isEmpty(value)) {
                return;
              }

              if (uniqueAttributeValues.containsKey(attributeId)) {
                Map<String, String> values = uniqueAttributeValues.get(attributeId);

                if (values.containsKey(value) && !values.get(value).equals(object.getUid())) {
                  errorReports.add(
                      new ErrorReport(
                              Attribute.class,
                              ErrorCode.E4009,
                              IdentifiableObjectUtils.getDisplayName(attribute),
                              value)
                          .setMainId(attribute.getUid())
                          .setErrorProperty("value"));
                } else {
                  uniqueAttributeValues.get(attribute.getUid()).put(value, object.getUid());
                }
              } else {
                uniqueAttributeValues.put(attribute.getUid(), new HashMap<>());
                uniqueAttributeValues.get(attribute.getUid()).put(value, object.getUid());
              }
            });

    return errorReports;
  }
}
